﻿#region LicenseHeader

// Copyright 2012 The Trustees of Indiana University.  All rights reserved.
// 
// The Indiana University licenses this file to you under the Apache License, 
// Version 2.0 (the "License"); you may not use this file except in compliance 
// with the License.  You may obtain a copy of the License at 
// 
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software 
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  
// See the License for the specific language governing permissions and 
// limitations under the License.
// 
// @author Thilina Gunarathne (tgunarat@indiana.edu)

#endregion

#region

using System.Collections.Generic;
using AzureMRCore.DataTypes;

#endregion

namespace AzureMRCore
{
    public class MapCombineOutputCollector<K, V> : IOutputCollector<K, V>
        where K : Key
        where V : new()
    {
        private readonly Dictionary<K, List<V>> outputs;

        public MapCombineOutputCollector()
        {
            KeyComparer keyComparer = new KeyComparer();
            outputs = new Dictionary<K, List<V>>(keyComparer);
        }

        #region IOutputCollector<K,V> Members

        public void Collect(K key, V value)
        {
            if (outputs.ContainsKey(key))
            {
                List<V> values = outputs[key];
                values.Add(value);
            }
            else
            {
                List<V> values = new List<V>();
                outputs.Add(key, values);
                values.Add(value);
            }
        }

        #endregion

        public Dictionary<K, List<V>> GetResults()
        {
            return outputs;
        }
    }
}